package com.ljx.qqpro.websocket;

import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.ljx.qqpro.entity.ChatEntity;
import com.ljx.qqpro.entity.ChatUserEntity;
import com.ljx.qqpro.service.ChatService;
import com.ljx.qqpro.service.ChatUserService;
import com.ljx.qqpro.vo.message.MessageChatList;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * 聊天列表
 */
@Component
@Slf4j
@ServerEndpoint("/chatList/{userId}")
public class ChatListInfoWebSocket {

    public static ChatService chatService;

    public static ChatUserService chatUserService;

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;

    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<ChatListInfoWebSocket> chatWebSockets = new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            chatWebSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】聊天列表有新的连接，总数为:" + chatWebSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            chatWebSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】聊天列表连接断开，总数为:" + chatWebSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     */
    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】聊天列表收到客户端消息:" + message);

        MessageChatList messageChatList = JSONUtil.toBean(message, MessageChatList.class);

        List<ChatUserEntity> chatUserEntityList = chatUserService.list(new QueryWrapper<ChatUserEntity>().eq("chat_id", messageChatList.getChatId()));

        // 处理每个聊天成员信息
        for (ChatUserEntity chatUserEntity : chatUserEntityList) {
            Session session = sessionPool.get(String.valueOf(chatUserEntity.getUserId()));
            if(session != null && session.isOpen()){
                session.getAsyncRemote().sendText(message);
            }
            else{
                // 未在线的用户处理
                // 查询未读消息数量
                ChatUserEntity one = chatUserService.getOne(new QueryWrapper<ChatUserEntity>().eq("user_id", chatUserEntity.getUserId())
                        .eq("chat_id", chatUserEntity.getChatId()).eq("status", 1));
                one.setUnreadCount(one.getUnreadCount() + 1);
                // 更新未读数量
                chatUserService.updateById(one);
            }
        }

        // 更新聊天最后一次消息
        ChatEntity chatEntity = chatService.getById(messageChatList.getChatId());
        chatEntity.setLastMessage(messageChatList.getContent());
        chatService.updateById(chatEntity);

    }

    /**
     * 发送错误时的处理
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }
}
